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Running the tests in ‘tests/plotAlternativesValuesPreorder.R’ failed.
Complete output:
  > library(MCDA)
  > 
  > alternativesValues <- c(10,1,8,3,8,3,4,4,8,5)
  > 
  > names(alternativesValues) <- c("x10","x1","x9","x2","x8","x3","x7","x4","x6","x5")
  > 
  > plotAlternativesValuesPreorder(alternativesValues, decreasing=TRUE, alternativesIDs=c("x10","x3","x7","x4","x6","x5"))
  Error in plotAlternativesValuesPreorder(alternativesValues, decreasing = TRUE,  : 
    Rgraphviz package could not be loaded
  Execution halted